Through a Microscope: Something of the Science, Together with many Curious Observations Indoor and Out and Directions for a Home-made Microscope.Wells, Samuel
History
Through a Microscope: Something of the Science, Together with many Curious Observations Indoor and Out and Directions for a Home-made Microscope.
Wells, Samuel
Microscopes; Microscopy; Natural history
And who knows what grave matters may be settled during these conclaves?
or perhaps they are only rehearsing gossip, as they have had every
possible chance to see what was going on among their neighbors.
[Illustration: THE STENTORS.--"VERITABLE TRUMPETS."]
Sometimes one settles down alone near a group of others, and seems to
proclaim in stentorian voice that it is reception day and he is ready to
receive. Or perhaps he is simply a herald as his name indicates, whose
business it is to conduct ceremonies and regulate affairs! At any rate,
though our ears are too dull to catch the voices of these curious beings
of a lower world--so near, and yet in another sense, so far away, it
would be difficult to believe that these animated creatures have no
means of communication and nothing to communicate.
PART II
THROUGH A MICROSCOPE
BY MARY TREAT
IX.--THE UTRICULARIA.
It seems strange that innocent-looking plants should capture and kill
animals; but this is really what the Bladderworts (_Utricularia_) are
all the time doing. They grow in ponds and swamps, some species in deep,
still water, others in shallow ponds.
Fig. 1 shows a portion of the stem of _Utricularia clandestina_, natural
size. The little bladders are so nearly transparent, that on bringing
them under the microscope, or even under a good lens, you can see the
numerous creatures that they have captured, some partly consumed, others
still alive.
The bladders on these curious plants remind one of some of the
_Entomostracans_ which Mr. Wells described in his fourth paper. Look at
_Chydorus sphericus_ for instance, and then at the magnified bladder
(_Fig. 2_) in this article. The branched horns at the mouth or entrance
have very much the appearance of the antennae of some of the minute
animals, and the stem when it is attached to the main branch may be
likened to a tail. But the way in which they capture and devour the
pretty little creatures that come within their grasp makes them appear,
even more than they look, like wicked animals.
[Illustration: FIG. 1. PORTION OF A STEM OF UTRICULARIA CLANDESTINA;
NATURAL SIZE.]
I have found almost every swimming animalculae with which I am
acquainted, caught in these vegetable traps; and when caught they never
escape. Their entrance is easy enough; there is a sensitive valve at the
mouth of the bladder, which, if they touch it, flies open and draws
them in as quick as a flash. These downward-opening bladders not only
entrap animalculae, but, more wonderful still, the strong larvae of
insects. The larvae most frequently caught are those of the mosquito and
chironomus. Often the mosquito is caught tail first--the entire body
inclosed and the head left sticking out. It always looks as if the
victim might walk or wriggle out, but it never does; and you may be sure
that it never backed in there of its own accord.
Public-domain text, read in full here on John Shaqi.
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